FFmpeg/libavcodec/vc9.c

/*
 * VC-9 and WMV3 decoder
 * Copyright (c) 2005 Anonymous
 * Copyright (c) 2005 Alex Beregszaszi
 * Copyright (c) 2005 Michael Niedermayer
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/**
 * @file vc9.c
 * VC-9 and WMV3 decoder
 *
 * TODO: most AP stuff, optimize, most of MB layer, transform, filtering and motion compensation, etc
 * TODO: use MPV_ !!
 */
#include "common.h"
#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "vc9data.h"

#undef NDEBUG
#include <assert.h>

extern const uint32_t ff_table0_dc_lum[120][2], ff_table1_dc_lum[120][2];
extern const uint32_t ff_table0_dc_chroma[120][2], ff_table1_dc_chroma[120][2];
extern VLC ff_msmp4_dc_luma_vlc[2], ff_msmp4_dc_chroma_vlc[2];
#define MB_INTRA_VLC_BITS 9
extern VLC ff_msmp4_mb_i_vlc;
#define DC_VLC_BITS 9
static const uint16_t table_mb_intra[64][2];

/* Some inhibiting stuff */
#define HAS_ADVANCED_PROFILE   1
#define TRACE                  1

#if TRACE
#  define INIT_VLC(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, \
                   codes, codes_wrap, codes_size, use_static)          \
  if (init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size,     \
               codes, codes_wrap, codes_size, use_static) < 0)         \
  {                                                                    \
    av_log(v->s.avctx, AV_LOG_ERROR, "Error for " # vlc " (%i)\n", i);   \
    return -1;                                                         \
  }
#else
#  define INIT_VLC(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, \
                   codes, codes_wrap, codes_size, use_static)          \
  init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size,         \
           codes, codes_wrap, codes_size, use_static)
#endif

/** Available Profiles */
//@{
#define PROFILE_SIMPLE   0
#define PROFILE_MAIN     1
#define PROFILE_COMPLEX  2 ///< TODO: WMV9 specific
#define PROFILE_ADVANCED 3
//@}

/** Sequence quantizer mode */
//@{
#define QUANT_FRAME_IMPLICIT   0 ///< Implicitly specified at frame level
#define QUANT_FRAME_EXPLICIT   1 ///< Explicitly specified at frame level
#define QUANT_NON_UNIFORM      2 ///< Non-uniform quant used for all frames
#define QUANT_UNIFORM          3 ///< Uniform quant used for all frames
//@}

/** Where quant can be changed */
//@{
#define DQPROFILE_FOUR_EDGES   0
#define DQPROFILE_DOUBLE_EDGES 1
#define DQPROFILE_SINGLE_EDGE  2
#define DQPROFILE_ALL_MBS      3
//@}

/** @name Where quant can be changed
 */
//@{
#define DQPROFILE_FOUR_EDGES   0
#define DQSINGLE_BEDGE_LEFT   0
#define DQSINGLE_BEDGE_TOP    1
#define DQSINGLE_BEDGE_RIGHT  2
#define DQSINGLE_BEDGE_BOTTOM 3
//@}

/** Which pair of edges is quantized with ALTPQUANT */
//@{
#define DQDOUBLE_BEDGE_TOPLEFT     0
#define DQDOUBLE_BEDGE_TOPRIGHT    1
#define DQDOUBLE_BEDGE_BOTTOMRIGHT 2
#define DQDOUBLE_BEDGE_BOTTOMLEFT  3
//@}

/** MV modes for P frames */
//@{
#define MV_PMODE_1MV_HPEL_BILIN   0
#define MV_PMODE_1MV              1
#define MV_PMODE_1MV_HPEL         2
#define MV_PMODE_MIXED_MV         3
#define MV_PMODE_INTENSITY_COMP   4
//@}

/** @name MV types for B frames */
//@{
#define BMV_TYPE_BACKWARD          0
#define BMV_TYPE_BACKWARD          0
#define BMV_TYPE_FORWARD           1
#define BMV_TYPE_INTERPOLATED      3
//@}

/** MV P mode - the 5th element is only used for mode 1 */
static const uint8_t mv_pmode_table[2][5] = {
  { MV_PMODE_1MV_HPEL_BILIN, MV_PMODE_1MV, MV_PMODE_1MV_HPEL, MV_PMODE_MIXED_MV, MV_PMODE_INTENSITY_COMP },
  { MV_PMODE_1MV, MV_PMODE_MIXED_MV, MV_PMODE_1MV_HPEL, MV_PMODE_1MV_HPEL_BILIN, MV_PMODE_INTENSITY_COMP }
};

/** One more frame type */
#define BI_TYPE 7

static const int fps_nr[5] = { 24, 25, 30, 50, 60 },
  fps_dr[2] = { 1000, 1001 };
static const uint8_t pquant_table[3][32] = {
  {  /* Implicit quantizer */
     0,  1,  2,  3,  4,  5,  6,  7,  8,  6,  7,  8,  9, 10, 11, 12,
    13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 31
  },
  {  /* Explicit quantizer, pquantizer uniform */
     0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
    16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
  },
  {  /* Explicit quantizer, pquantizer non-uniform */
     0,  1,  1,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13,
    14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 31
  }
};

/** @name VC-9 VLC tables and defines
 *  @todo TODO move this into the context
 */
//@{
#define VC9_BFRACTION_VLC_BITS 7
static VLC vc9_bfraction_vlc;
#define VC9_IMODE_VLC_BITS 4
static VLC vc9_imode_vlc;
#define VC9_NORM2_VLC_BITS 3
static VLC vc9_norm2_vlc;
#define VC9_NORM6_VLC_BITS 9
static VLC vc9_norm6_vlc;
/* Could be optimized, one table only needs 8 bits */
#define VC9_TTMB_VLC_BITS 9 //12
static VLC vc9_ttmb_vlc[3];
#define VC9_MV_DIFF_VLC_BITS 9 //15
static VLC vc9_mv_diff_vlc[4];
#define VC9_CBPCY_P_VLC_BITS 9 //14
static VLC vc9_cbpcy_p_vlc[4];
#define VC9_4MV_BLOCK_PATTERN_VLC_BITS 6
static VLC vc9_4mv_block_pattern_vlc[4];
#define VC9_TTBLK_VLC_BITS 5
static VLC vc9_ttblk_vlc[3];
#define VC9_SUBBLKPAT_VLC_BITS 6
static VLC vc9_subblkpat_vlc[3];
//@}

/** Bitplane struct
 * We mainly need data and is_raw, so this struct could be avoided
 * to save a level of indirection; feel free to modify
 * @fixme For now, stride=width
 * @warning Data are bits, either 1 or 0
 */
typedef struct BitPlane {
    uint8_t *data;      ///< Data buffer
    int width;          ///< Width of the buffer
    int stride;         ///< Stride of the buffer
    int height;         ///< Plane height
    uint8_t is_raw;     ///< Bit values must be read at MB level
} BitPlane;

/** The VC9 Context */
typedef struct VC9Context{
    MpegEncContext s;

    /** Simple/Main Profile sequence header */
    //@{
    int res_sm;           ///< reserved, 2b
    int res_x8;           ///< reserved
    int multires;         ///< frame-level RESPIC syntax element present
    int res_fasttx;       ///< reserved, always 1
    int res_transtab;     ///< reserved, always 0
    int rangered;         ///< RANGEREDFRM (range reduction) syntax element present
                          ///< at frame level
    int res_rtm_flag;     ///< reserved, set to 1
    int reserved;         ///< reserved
    //@}

#if HAS_ADVANCED_PROFILE
    /** Advanced Profile */
    //@{
    int level;            ///< 3bits, for Advanced/Simple Profile, provided by TS layer
    int chromaformat;     ///< 2bits, 2=4:2:0, only defined
    int postprocflag;     ///< Per-frame processing suggestion flag present
    int broadcast;        ///< TFF/RFF present
    int interlace;        ///< Progressive/interlaced (RPTFTM syntax element)
    int tfcntrflag;       ///< TFCNTR present
    int panscanflag;      ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
    int extended_dmv;     ///< Additional extended dmv range at P/B frame-level
    int color_prim;       ///< 8bits, chroma coordinates of the color primaries
    int transfer_char;    ///< 8bits, Opto-electronic transfer characteristics
    int matrix_coef;      ///< 8bits, Color primaries->YCbCr transform matrix
    int hrd_param_flag;   ///< Presence of Hypothetical Reference
                          ///< Decoder parameters
    //@}
#endif


    /** Sequence header data for all Profiles
     * TODO: choose between ints, uint8_ts and monobit flags
     */
    //@{
    int profile;          ///< 2bits, Profile
    int frmrtq_postproc;  ///< 3bits, 
    int bitrtq_postproc;  ///< 5bits, quantized framerate-based postprocessing strength
    int fastuvmc;         ///< Rounding of qpel vector to hpel ? (not in Simple)
    int extended_mv;      ///< Ext MV in P/B (not in Simple)
    int dquant;           ///< How qscale varies with MBs, 2bits (not in Simple)
    int vstransform;      ///< variable-size [48]x[48] transform type + info
    int overlap;          ///< overlapped transforms in use
    int quantizer_mode;   ///< 2bits, quantizer mode used for sequence, see QUANT_*
    int finterpflag;      ///< INTERPFRM present
    //@}

    /** Frame decoding info for all profiles */
    //@{
    uint8_t mv_mode;      ///< MV coding monde
    uint8_t mv_mode2;     ///< Secondary MV coding mode (B frames)
    int k_x;              ///< Number of bits for MVs (depends on MV range)
    int k_y;              ///< Number of bits for MVs (depends on MV range)
    uint8_t pq, altpq;    ///< Current/alternate frame quantizer scale
    /** pquant parameters */
    //@{
    uint8_t dquantfrm;
    uint8_t dqprofile;
    uint8_t dqsbedge;
    uint8_t dqbilevel;
    //@}
    int ac_table_level;   ///< Index for AC tables from ACFRM element
    int ttfrm;            ///< Transform type info present at frame level
    uint8_t ttmbf;        ///< Transform type flag
    int ttmb;             ///< Transform type
    uint8_t ttblk4x4;     ///< Value of ttblk which indicates a 4x4 transform
    /** Luma compensation parameters */
    //@{
    uint8_t lumscale;
    uint8_t lumshift;
    //@}
    int16_t bfraction;    ///< Relative position % anchors=> how to scale MVs
    uint8_t halfpq;       ///< Uniform quant over image and qp+.5
    uint8_t respic;       ///< Frame-level flag for resized images
    int buffer_fullness;  ///< HRD info
    /** Ranges:
     * -# 0 -> [-64n 63.f] x [-32, 31.f]
     * -# 1 -> [-128, 127.f] x [-64, 63.f]
     * -# 2 -> [-512, 511.f] x [-128, 127.f]
     * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
     */
    uint8_t mvrange;
    uint8_t pquantizer;           ///< Uniform (over sequence) quantizer in use
    uint8_t *previous_line_cbpcy; ///< To use for predicted CBPCY
    VLC *cbpcy_vlc;               ///< CBPCY VLC table
    int tt_index;                 ///< Index for Transform Type tables
    BitPlane mv_type_mb_plane;    ///< bitplane for mv_type == (4MV)
    BitPlane skip_mb_plane;       ///< bitplane for skipped MBs
    BitPlane direct_mb_plane;     ///< bitplane for "direct" MBs

    /** Frame decoding info for S/M profiles only */
    //@{
    uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
    uint8_t interpfrm;
    //@}

#if HAS_ADVANCED_PROFILE
    /** Frame decoding info for Advanced profile */
    //@{
    uint8_t fcm; ///< 0->Progressive, 2->Frame-Interlace, 3->Field-Interlace
    uint8_t numpanscanwin;
    uint8_t tfcntr;
    uint8_t rptfrm, tff, rff;
    uint16_t topleftx;
    uint16_t toplefty;
    uint16_t bottomrightx;
    uint16_t bottomrighty;
    uint8_t uvsamp;
    uint8_t postproc;
    int hrd_num_leaky_buckets;
    uint8_t bit_rate_exponent;
    uint8_t buffer_size_exponent;
    BitPlane ac_pred_plane;       ///< AC prediction flags bitplane
    BitPlane over_flags_plane;    ///< Overflags bitplane
    uint8_t condover;
    uint16_t *hrd_rate, *hrd_buffer;
    int ac2_table_level;          ///< Index for AC2 tables from AC2FRM element
    //@}
#endif
} VC9Context;

/**
 * Get unary code of limited length
 * @fixme FIXME Slow and ugly
 * @param gb GetBitContext
 * @param[in] stop The bitstop value (unary code of 1's or 0's)
 * @param[in] len Maximum length
 * @return Unary length/index
 */
static int get_prefix(GetBitContext *gb, int stop, int len)
{
#if 1
  int i = 0, tmp = !stop;

  while (i != len && tmp != stop)
  {
    tmp = get_bits(gb, 1);
    i++;
  }
  if (i == len && tmp != stop) return len+1;
  return i;
#else
  unsigned int buf;
  int log;

  OPEN_READER(re, gb);
  UPDATE_CACHE(re, gb);
  buf=GET_CACHE(re, gb); //Still not sure
  if (stop) buf = ~buf;
  
  log= av_log2(-buf); //FIXME: -?
  if (log < limit){
    LAST_SKIP_BITS(re, gb, log+1);
    CLOSE_READER(re, gb);
    return log;
  }
  
  LAST_SKIP_BITS(re, gb, limit);
  CLOSE_READER(re, gb);
  return limit;
#endif
}

/**
 * Init VC-9 specific tables and VC9Context members
 * @param v The VC9Context to initialize
 * @return Status
 */
static int vc9_init_common(VC9Context *v)
{
    static int done = 0;
    int i = 0;

    /* Set the bit planes */
    v->mv_type_mb_plane = (struct BitPlane) { NULL, 0, 0, 0 };
    v->direct_mb_plane = (struct BitPlane) { NULL, 0, 0, 0 };
    v->skip_mb_plane = (struct BitPlane) { NULL, 0, 0, 0 };
#if HAS_ADVANCED_PROFILE
    v->ac_pred_plane = v->over_flags_plane = (struct BitPlane) { NULL, 0, 0, 0 };
    v->hrd_rate = v->hrd_buffer = NULL;
#endif

    /* VLC tables */
#if 0 // spec -> actual tables converter
    for(i=0; i<64; i++){
        int code= (vc9_norm6_spec[i][1] << vc9_norm6_spec[i][4]) + vc9_norm6_spec[i][3];
        av_log(NULL, AV_LOG_DEBUG, "0x%03X, ", code);
        if(i%16==15) av_log(NULL, AV_LOG_DEBUG, "\n");
    }
    for(i=0; i<64; i++){
        int code= vc9_norm6_spec[i][2] + vc9_norm6_spec[i][4];
        av_log(NULL, AV_LOG_DEBUG, "%2d, ", code);
        if(i%16==15) av_log(NULL, AV_LOG_DEBUG, "\n");
    }
#endif
    if(!done)
    {
        done = 1;
        INIT_VLC(&vc9_bfraction_vlc, VC9_BFRACTION_VLC_BITS, 23,
                 vc9_bfraction_bits, 1, 1,
                 vc9_bfraction_codes, 1, 1, 1);
        INIT_VLC(&vc9_norm2_vlc, VC9_NORM2_VLC_BITS, 4,
                 vc9_norm2_bits, 1, 1,
                 vc9_norm2_codes, 1, 1, 1);
        INIT_VLC(&vc9_norm6_vlc, VC9_NORM6_VLC_BITS, 64,
                 vc9_norm6_bits, 1, 1,
                 vc9_norm6_codes, 2, 2, 1);
        INIT_VLC(&vc9_imode_vlc, VC9_IMODE_VLC_BITS, 7,
                 vc9_imode_bits, 1, 1,
                 vc9_imode_codes, 1, 1, 1);
        for (i=0; i<3; i++)
        {
            INIT_VLC(&vc9_ttmb_vlc[i], VC9_TTMB_VLC_BITS, 16,
                     vc9_ttmb_bits[i], 1, 1,
                     vc9_ttmb_codes[i], 2, 2, 1);
            INIT_VLC(&vc9_ttblk_vlc[i], VC9_TTBLK_VLC_BITS, 8,
                     vc9_ttblk_bits[i], 1, 1,
                     vc9_ttblk_codes[i], 1, 1, 1);
            INIT_VLC(&vc9_subblkpat_vlc[i], VC9_SUBBLKPAT_VLC_BITS, 15,
                     vc9_subblkpat_bits[i], 1, 1,
                     vc9_subblkpat_codes[i], 1, 1, 1);
        }
        for(i=0; i<4; i++)
        {
            INIT_VLC(&vc9_4mv_block_pattern_vlc[i], VC9_4MV_BLOCK_PATTERN_VLC_BITS, 16,
                     vc9_4mv_block_pattern_bits[i], 1, 1,
                     vc9_4mv_block_pattern_codes[i], 1, 1, 1);
            INIT_VLC(&vc9_cbpcy_p_vlc[i], VC9_CBPCY_P_VLC_BITS, 64,
                     vc9_cbpcy_p_bits[i], 1, 1,
                     vc9_cbpcy_p_codes[i], 2, 2, 1);
            INIT_VLC(&vc9_mv_diff_vlc[i], VC9_MV_DIFF_VLC_BITS, 73,
                     vc9_mv_diff_bits[i], 1, 1,
                     vc9_mv_diff_codes[i], 2, 2, 1);
        }
    }

    /* Other defaults */
    v->pq = -1;
    v->mvrange = 0; /* 7.1.1.18, p80 */

    return 0;
}

#if HAS_ADVANCED_PROFILE
/**
 * Decode sequence header's Hypothetic Reference Decoder data
 * @see 6.2.1, p32
 * @param v The VC9Context to initialize
 * @param gb A GetBitContext initialized from AVCodecContext extra_data
 * @return Status
 */
static int decode_hrd(VC9Context *v, GetBitContext *gb)
{
    int i, num;

    num = get_bits(gb, 5);

    if (v->hrd_rate || num != v->hrd_num_leaky_buckets)
    {
        av_freep(&v->hrd_rate);
    }
    if (!v->hrd_rate) v->hrd_rate = av_malloc(num*sizeof(uint16_t));
    if (!v->hrd_rate) return -1;

    if (v->hrd_buffer || num != v->hrd_num_leaky_buckets)
    {
        av_freep(&v->hrd_buffer);
    }
    if (!v->hrd_buffer) v->hrd_buffer = av_malloc(num*sizeof(uint16_t));
    if (!v->hrd_buffer) return -1;

    v->hrd_num_leaky_buckets = num;

    //exponent in base-2 for rate
    v->bit_rate_exponent = get_bits(gb, 4);
    //exponent in base-2 for buffer_size
    v->buffer_size_exponent = get_bits(gb, 4);

    for (i=0; i<num; i++)
    {
        //mantissae, ordered (if not, use a function ?
        v->hrd_rate[i] = get_bits(gb, 16);
        if (i && v->hrd_rate[i-1]>=v->hrd_rate[i])
        {
            av_log(v->s.avctx, AV_LOG_ERROR, "HDR Rates aren't strictly increasing:"
                   "%i vs %i\n", v->hrd_rate[i-1], v->hrd_rate[i]);
            return -1;
        }
        v->hrd_buffer[i] = get_bits(gb, 16);
        if (i && v->hrd_buffer[i-1]<v->hrd_buffer[i])
        {
            av_log(v->s.avctx, AV_LOG_ERROR, "HDR Buffers aren't decreasing:"
                   "%i vs %i\n", v->hrd_buffer[i-1], v->hrd_buffer[i]);
            return -1;
        }
    }
    return 0;
}

/**
 * Decode sequence header for Advanced Profile
 * @see Table 2, p18
 * @see 6.1.7, pp21-27
 * @param v The VC9Context to initialize
 * @param gb A GetBitContext initialized from AVCodecContext extra_data
 * @return Status
 */
static int decode_advanced_sequence_header(AVCodecContext *avctx, GetBitContext *gb)
{
    VC9Context *v = avctx->priv_data;
    int nr, dr, aspect_ratio;

    v->postprocflag = get_bits(gb, 1);
    v->broadcast = get_bits(gb, 1);
    v->interlace = get_bits(gb, 1);

    v->tfcntrflag = get_bits(gb, 1);
    v->finterpflag = get_bits(gb, 1); //common
    v->panscanflag = get_bits(gb, 1);
    v->reserved = get_bits(gb, 1);
    if (v->reserved)
    {
        av_log(avctx, AV_LOG_ERROR, "RESERVED should be 0 (is %i)\n",
               v->reserved);
        return -1;
    }
    if (v->extended_mv)
        v->extended_dmv = get_bits(gb, 1);

    /* 6.1.7, p21 */
    if (get_bits(gb, 1) /* pic_size_flag */)
    {
        avctx->coded_width = get_bits(gb, 12);
        avctx->coded_height = get_bits(gb, 12);
        if ( get_bits(gb, 1) /* disp_size_flag */)
        {
            avctx->width = get_bits(gb, 14);
            avctx->height = get_bits(gb, 14);
        }

        /* 6.1.7.4, p22 */
        if ( get_bits(gb, 1) /* aspect_ratio_flag */)
        {
            aspect_ratio = get_bits(gb, 4); //SAR
            if (aspect_ratio == 0x0F) //FF_ASPECT_EXTENDED
            {
                avctx->sample_aspect_ratio.num = get_bits(gb, 8);
                avctx->sample_aspect_ratio.den = get_bits(gb, 8);
            }
            else if (aspect_ratio == 0x0E)
            {
                av_log(avctx, AV_LOG_DEBUG, "Reserved AR found\n");
            }
            else
            {
              avctx->sample_aspect_ratio = vc9_pixel_aspect[aspect_ratio];
            }
        }
    }
    else
    {
        avctx->coded_width = avctx->width;
        avctx->coded_height = avctx->height;
    }

    /* 6.1.8, p23 */
    if ( !get_bits(gb, 1) /* framerateflag */)
    {
        if ( get_bits(gb, 1) /* framerateind */)
        {
            nr = get_bits(gb, 8);
            dr = get_bits(gb, 4);
            if (nr<1)
            {
                av_log(avctx, AV_LOG_ERROR, "0 is forbidden for FRAMERATENR\n");
                return -1;
            }
            if (nr>5)
            {
                av_log(avctx, AV_LOG_ERROR,
                       "Reserved FRAMERATENR %i not handled\n", nr);
           }
            if (dr<1)
            {
                av_log(avctx, AV_LOG_ERROR, "0 is forbidden for FRAMERATEDR\n");
           }
            if (dr>2)
            {
                av_log(avctx, AV_LOG_ERROR,
                       "Reserved FRAMERATEDR %i not handled\n", dr);
            }
            avctx->frame_rate_base = fps_nr[dr];
            avctx->frame_rate = fps_nr[nr];
        }
        else
        {
            nr = get_bits(gb, 16);
            // 0.03125->2048Hz / 0.03125Hz
            avctx->frame_rate = 1000000;
            avctx->frame_rate_base = 31250*(1+nr);
        }
    }

    /* 6.1.9, p25 */
    if ( get_bits(gb, 1) /* color_format_flag */)
    {
        //Chromacity coordinates of color primaries
        //like ITU-R BT.709-2, BT.470-2, ...
        v->color_prim = get_bits(gb, 8);
        if (v->color_prim<1)
        {
            av_log(avctx, AV_LOG_ERROR, "0 for COLOR_PRIM is reserved\n");
            return -1;
        }
        if (v->color_prim == 3 || v->color_prim>6)
        {
            av_log(avctx, AV_LOG_DEBUG, "Reserved COLOR_PRIM %i found\n",
                   v->color_prim);
            return -1;
        }

        //Opto-electronic transfer characteristics
        v->transfer_char = get_bits(gb, 8);
        if (v->transfer_char == 3 || v->transfer_char>8)
        {
            av_log(avctx, AV_LOG_DEBUG, "Reserved TRANSFERT_CHAR %i found\n",
                   v->color_prim);
            return -1;
        }

        //Matrix coefficient for primariev->YCbCr
        v->matrix_coef = get_bits(gb, 8);
        if (v->matrix_coef < 1) return -1; //forbidden
        if ((v->matrix_coef>3 && v->matrix_coef<6) || v->matrix_coef>7)
        {
            av_log(avctx, AV_LOG_DEBUG, "Reserved MATRIX_COEF %i found\n",
                   v->color_prim);
            return -1;
        }
    }

    //Hypothetical reference decoder indicator flag
    v->hrd_param_flag = get_bits(gb, 1);
    if (v->hrd_param_flag)
    {
      if (decode_hrd(v, gb) < 0) return -1;
    }

    av_log(avctx, AV_LOG_DEBUG, "Advanced profile not supported yet\n");
    return -1;
}
#endif

/** 
 * Decode Simple/Main Profiles sequence header
 * @see Figure 7-8, p16-17
 * @param avctx Codec context
 * @param gb GetBit context initialized from Codec context extra_data
 * @return Status
 */
static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)
{
    VC9Context *v = avctx->priv_data;

    av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits(gb, 32));
    v->profile = get_bits(gb, 2);
    if (v->profile == 2)
        av_log(avctx, AV_LOG_ERROR, "Profile 2 is reserved\n");

#if HAS_ADVANCED_PROFILE
    if (v->profile == PROFILE_ADVANCED)
    {
        v->level = get_bits(gb, 3);
        v->chromaformat = get_bits(gb, 2);
        if (v->chromaformat != 1)
        {
            av_log(avctx, AV_LOG_ERROR,
                   "Only 4:2:0 chroma format supported\n");
            return -1;
        }
    }
    else
#endif
    {
        v->res_sm = get_bits(gb, 2); //reserved
        if (v->res_sm)
        {
            av_log(avctx, AV_LOG_ERROR,
                   "Reserved RES_SM=%i is forbidden\n", v->res_sm);
            return -1;
        }
    }

    // (fps-2)/4 (->30)
    v->frmrtq_postproc = get_bits(gb, 3); //common
    // (bitrate-32kbps)/64kbps
    v->bitrtq_postproc = get_bits(gb, 5); //common
    v->s.loop_filter = get_bits(gb, 1); //common

#if HAS_ADVANCED_PROFILE
    if (v->profile < PROFILE_ADVANCED)
#endif
    {
        v->res_x8 = get_bits(gb, 1); //reserved
        if (v->res_x8)
        {
            av_log(avctx, AV_LOG_ERROR,
                   "1 for reserved RES_X8 is forbidden\n");
            //return -1;
        }
        v->multires = get_bits(gb, 1);
        v->res_fasttx = get_bits(gb, 1);
        if (!v->res_fasttx)
        {
            av_log(avctx, AV_LOG_ERROR,
                   "0 for reserved RES_FASTTX is forbidden\n");
            //return -1;
        }
    }

    v->fastuvmc =  get_bits(gb, 1); //common
    if (!v->profile && !v->fastuvmc)
    {
        av_log(avctx, AV_LOG_ERROR,
               "FASTUVMC unavailable in Simple Profile\n");
        return -1;
    }
    v->extended_mv =  get_bits(gb, 1); //common
    if (!v->profile && v->extended_mv)
    {
        av_log(avctx, AV_LOG_ERROR,
               "Extended MVs unavailable in Simple Profile\n");
        return -1;
    }
    v->dquant =  get_bits(gb, 2); //common
    v->vstransform =  get_bits(gb, 1); //common
    
#if HAS_ADVANCED_PROFILE
    if (v->profile < PROFILE_ADVANCED)
#endif
    {
        v->res_transtab = get_bits(gb, 1);
        if (v->res_transtab)
        {
            av_log(avctx, AV_LOG_ERROR,
                   "1 for reserved RES_TRANSTAB is forbidden\n");
            return -1;
        }
    }

    v->overlap = get_bits(gb, 1); //common

#if HAS_ADVANCED_PROFILE
    if (v->profile < PROFILE_ADVANCED)
#endif
    {
        v->s.resync_marker = get_bits(gb, 1);
        v->rangered = get_bits(gb, 1);
    }

    v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common
    v->quantizer_mode = get_bits(gb, 2); //common

#if HAS_ADVANCED_PROFILE
    if (v->profile < PROFILE_ADVANCED)
#endif
    {
        v->finterpflag = get_bits(gb, 1); //common
        v->res_rtm_flag = get_bits(gb, 1); //reserved
        if (!v->res_rtm_flag)
        {
            av_log(avctx, AV_LOG_ERROR,
                   "0 for reserved RES_RTM_FLAG is forbidden\n");
            //return -1;
        }
#if TRACE
        av_log(avctx, AV_LOG_INFO,
               "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"
               "LoopFilter=%i, MultiRes=%i, FastUVMV=%i, Extended MV=%i\n"
               "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"
               "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",
               v->profile, v->frmrtq_postproc, v->bitrtq_postproc,
               v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,
               v->rangered, v->vstransform, v->overlap, v->s.resync_marker,
               v->dquant, v->quantizer_mode, avctx->max_b_frames
               );
        return 0;
#endif
    }
#if HAS_ADVANCED_PROFILE
    else return decode_advanced_sequence_header(avctx, gb);
#endif
}


#if HAS_ADVANCED_PROFILE
/** Entry point decoding (Advanced Profile)
 * @param avctx Codec context
 * @param gb GetBit context initialized from avctx->extra_data
 * @return Status
 */
static int advanced_entry_point_process(AVCodecContext *avctx, GetBitContext *gb)
{
    VC9Context *v = avctx->priv_data;
    int range_mapy_flag, range_mapuv_flag, i;
    if (v->profile != PROFILE_ADVANCED)
    {
        av_log(avctx, AV_LOG_ERROR,
               "Entry point are only defined in Advanced Profile!\n");
        return -1; //Only for advanced profile!
    }
    if (v->hrd_param_flag)
    {
        //Update buffer fullness
        av_log(avctx, AV_LOG_DEBUG, "Buffer fullness update\n");
        for (i=0; i<v->hrd_num_leaky_buckets; i++)
            skip_bits(gb, 8);
    }
    if ((range_mapy_flag = get_bits(gb, 1)))
    {
        //RANGE_MAPY
        av_log(avctx, AV_LOG_DEBUG, "RANGE_MAPY\n");
        skip_bits(gb, 3);
    }
    if ((range_mapuv_flag = get_bits(gb, 1)))
    {
        //RANGE_MAPUV
        av_log(avctx, AV_LOG_DEBUG, "RANGE_MAPUV\n");
        skip_bits(gb, 3);
    }
    if (v->panscanflag)
    {
        //NUMPANSCANWIN
        v->numpanscanwin = get_bits(gb, 3);
        av_log(avctx, AV_LOG_DEBUG, "NUMPANSCANWIN: %u\n", v->numpanscanwin);
    }
    return 0;
}
#endif

/***********************************************************************/
/**
 * @defgroup bitplane VC9 Bitplane decoding
 * @see 8.7, p56
 * @{
 */

/** @addtogroup bitplane
 * Imode types
 * @{
 */
#define IMODE_RAW     0
#define IMODE_NORM2   1
#define IMODE_DIFF2   2
#define IMODE_NORM6   3
#define IMODE_DIFF6   4
#define IMODE_ROWSKIP 5
#define IMODE_COLSKIP 6
/** @} */ //imode defines

/** Allocate the buffer from a bitplane, given its dimensions
 * @param bp Bitplane which buffer is to allocate
 * @param[in] width Width of the buffer
 * @param[in] height Height of the buffer
 * @return Status
 * @todo TODO: Take into account stride
 * @todo TODO: Allow use of external buffers ?
 */
int alloc_bitplane(BitPlane *bp, int width, int height)
{
    if (!bp || bp->width<0 || bp->height<0) return -1;
    bp->data = (uint8_t*)av_malloc(width*height);
    if (!bp->data) return -1;
    bp->width = bp->stride = width; 
    bp->height = height;
    return 0;
}

/** Free the bitplane's buffer
 * @param bp Bitplane which buffer is to free
 */
void free_bitplane(BitPlane *bp)
{
    bp->width = bp->stride = bp->height = 0;
    if (bp->data) av_freep(&bp->data);
}

/** Decode rows by checking if they are skiped
 * @param plane Buffer to store decoded bits
 * @param[in] width Width of this buffer
 * @param[in] height Height of this buffer
 * @param[in] stride of this buffer
 */
static void decode_rowskip(uint8_t* plane, int width, int height, int stride, GetBitContext *gb){
    int x, y;

    for (y=0; y<height; y++){
        if (!get_bits(gb, 1)) //rowskip
            memset(plane, 0, width);
        else
            for (x=0; x<width; x++) 
                plane[x] = get_bits(gb, 1);
        plane += stride;
    }
}

/** Decode columns by checking if they are skiped
 * @param plane Buffer to store decoded bits
 * @param[in] width Width of this buffer
 * @param[in] height Height of this buffer
 * @param[in] stride of this buffer
 * @fixme FIXME: Optimize
 */
static void decode_colskip(uint8_t* plane, int width, int height, int stride, GetBitContext *gb){
    int x, y;

    for (x=0; x<width; x++){
        if (!get_bits(gb, 1)) //colskip
            for (y=0; y<height; y++)
                plane[y*stride] = 0;
        else
            for (y=0; y<height; y++)
                plane[y*stride] = get_bits(gb, 1);
        plane ++;
    }
}

/** Decode a bitplane's bits
 * @param bp Bitplane where to store the decode bits
 * @param v VC9 context for bit reading and logging
 * @return Status
 * @fixme FIXME: Optimize
 * @todo TODO: Decide if a struct is needed
 */
static int bitplane_decoding(BitPlane *bp, VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;

    int imode, x, y, code, use_vertical_tile, tile_w, tile_h, offset;
    uint8_t invert, *planep = bp->data;

    invert = get_bits(gb, 1);
    imode = get_vlc2(gb, vc9_imode_vlc.table, VC9_IMODE_VLC_BITS, 2);

    bp->is_raw = 0;
    switch (imode)
    {
    case IMODE_RAW:
        //Data is actually read in the MB layer (same for all tests == "raw")
        bp->is_raw = 1; //invert ignored
        return invert;
    case IMODE_DIFF2:
    case IMODE_NORM2:
        if ((bp->height*bp->width) & 1)
        {
            *(++planep) = get_bits(gb, 1);
            offset = x = 1;
        }
        else offset = x = 0;
        
        for (y=0; y<bp->height; y++)
        {
            for(; x<bp->width; x+=2)
            {
                code = get_vlc2(gb, vc9_norm2_vlc.table, VC9_NORM2_VLC_BITS, 2);
                *(++planep) = code&1; //lsb => left
                *(++planep) = (code>>1)&1; //msb => right
            }
            planep += bp->stride-bp->width;
            if ((bp->width-offset)&1) //Odd number previously processed
            {
                code = get_vlc2(gb, vc9_norm2_vlc.table, VC9_NORM2_VLC_BITS, 2);
                *planep = code&1;
                planep += bp->stride-bp->width;
                *planep = (code>>1)&1; //msb => right
                offset = x = 1;
            }
            else
            {
                offset = x = 0;
                planep += bp->stride-bp->width;
            }
        }
        break;
    case IMODE_DIFF6:
    case IMODE_NORM6:
        use_vertical_tile=  bp->height%3==0 &&  bp->width%3!=0;
        tile_w= use_vertical_tile ? 2 : 3;
        tile_h= use_vertical_tile ? 3 : 2;

        for(y=  bp->height%tile_h; y< bp->height; y+=tile_h){
            for(x=  bp->width%tile_w; x< bp->width; x+=tile_w){
                code = get_vlc2(gb, vc9_norm6_vlc.table, VC9_NORM6_VLC_BITS, 2);
                if(code<0){
                    av_log(v->s.avctx, AV_LOG_DEBUG, "invalid NORM-6 VLC\n");
                    return -1;
                }
                //FIXME following is a pure guess and probably wrong
                //FIXME A bitplane (0 | !0), so could the shifts be avoided ?
                planep[x     + 0*bp->stride]= (code>>0)&1;
                planep[x + 1 + 0*bp->stride]= (code>>1)&1;
                //FIXME Does branch prediction help here?
                if(use_vertical_tile){
                    planep[x + 0 + 1*bp->stride]= (code>>2)&1;
                    planep[x + 1 + 1*bp->stride]= (code>>3)&1;
                    planep[x + 0 + 2*bp->stride]= (code>>4)&1;
                    planep[x + 1 + 2*bp->stride]= (code>>5)&1;
                }else{
                    planep[x + 2 + 0*bp->stride]= (code>>2)&1;
                    planep[x + 0 + 1*bp->stride]= (code>>3)&1;
                    planep[x + 1 + 1*bp->stride]= (code>>4)&1;
                    planep[x + 2 + 1*bp->stride]= (code>>5)&1;
                }
            }
        }

        x=  bp->width % tile_w;
        decode_colskip(bp->data  ,             x, bp->height         , bp->stride, &v->s.gb);
        decode_rowskip(bp->data+x, bp->width - x, bp->height % tile_h, bp->stride, &v->s.gb);

        break;
    case IMODE_ROWSKIP:
        decode_rowskip(bp->data, bp->width, bp->height, bp->stride, &v->s.gb);
        break;
    case IMODE_COLSKIP:
        decode_colskip(bp->data, bp->width, bp->height, bp->stride, &v->s.gb);
        break;
    default: break;
    }

    /* Applying diff operator */
    if (imode == IMODE_DIFF2 || imode == IMODE_DIFF6)
    {
        planep = bp->data;
        planep[0] ^= invert;
        for (x=1; x<bp->width; x++)
            planep[x] ^= planep[x-1];
        for (y=1; y<bp->height; y++)
        {
            planep += bp->stride;
            planep[0] ^= planep[-bp->stride];
            for (x=1; x<bp->width; x++)
            {
                if (planep[x-1] != planep[x-bp->stride]) planep[x] ^= invert;
                else                                     planep[x] ^= planep[x-1];
            }
        }
    }
    else if (invert)
    {
        planep = bp->data;
        for (x=0; x<bp->width*bp->height; x++) planep[x] = !planep[x]; //FIXME stride
    }
    return (imode<<1) + invert;
}
/** @} */ //Bitplane group

/***********************************************************************/
/** VOP Dquant decoding
 * @param v VC9 Context
 */
static int vop_dquant_decoding(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    int pqdiff;

    //variable size
    if (v->dquant == 2)
    {
        pqdiff = get_bits(gb, 3);
        if (pqdiff == 7) v->altpq = get_bits(gb, 5);
        else v->altpq = v->pq + pqdiff + 1;
    }
    else
    {
        v->dquantfrm = get_bits(gb, 1);
        if ( v->dquantfrm )
        {
            v->dqprofile = get_bits(gb, 2);
            switch (v->dqprofile)
            {
            case DQPROFILE_SINGLE_EDGE:
            case DQPROFILE_DOUBLE_EDGES:
                v->dqsbedge = get_bits(gb, 2);
                break;
            case DQPROFILE_ALL_MBS:
                v->dqbilevel = get_bits(gb, 1);
            default: break; //Forbidden ?
            }
            if (!v->dqbilevel || v->dqprofile != DQPROFILE_ALL_MBS)
            {
                pqdiff = get_bits(gb, 3);
                if (pqdiff == 7) v->altpq = get_bits(gb, 5);
                else v->altpq = v->pq + pqdiff + 1;
            }
        }
    }
    return 0;
}

/***********************************************************************/
/** 
 * @defgroup all_frame_hdr All VC9 profiles frame header
 * @brief Part of the frame header decoding from all profiles
 * @warning Only pro/epilog differs between Simple/Main and Advanced => check caller
 * @{
 */
/** B and BI frame header decoding, primary part
 * @see Tables 11+12, p62-65
 * @param v VC9 context
 * @return Status
 * @warning Also handles BI frames
 */
static int decode_b_picture_primary_header(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    int pqindex;

    /* Prolog common to all frametypes should be done in caller */
    if (v->profile == PROFILE_SIMPLE)
    {
        av_log(v->s.avctx, AV_LOG_ERROR, "Found a B frame while in Simple Profile!\n");
        return FRAME_SKIPED;
    }
    v->bfraction = vc9_bfraction_lut[get_vlc2(gb, vc9_bfraction_vlc.table,
                                              VC9_BFRACTION_VLC_BITS, 2)];
    if (v->bfraction < -1)
    {
        av_log(v->s.avctx, AV_LOG_ERROR, "Invalid BFRaction\n");
        return FRAME_SKIPED;
    }
    else if (!v->bfraction)
    {
        /* We actually have a BI frame */
        v->s.pict_type = BI_TYPE;
        v->buffer_fullness = get_bits(gb, 7);
    }

    /* Read the quantization stuff */
    pqindex = get_bits(gb, 5);
    if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
        v->pq = pquant_table[0][pqindex];
    else
    {
        v->pq = pquant_table[v->quantizer_mode-1][pqindex];
    }
    if (pqindex < 9) v->halfpq = get_bits(gb, 1);
    if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
        v->pquantizer = get_bits(gb, 1);

    if (v->profile == PROFILE_ADVANCED)
    {
        if (v->postprocflag) v->postproc = get_bits(gb, 2);
        if (v->extended_mv == 1 && v->s.pict_type != BI_TYPE)
            v->mvrange = get_prefix(gb, 0, 3);
    }
    else
    {
        if (v->extended_mv == 1)
            v->mvrange = get_prefix(gb, 0, 3);
    }
    /* Read the MV mode */
    if (v->s.pict_type != BI_TYPE)
    {
        v->mv_mode = get_bits(gb, 1);
        if (v->pq < 13)
        {
            if (!v->mv_mode)
            {
                v->mv_mode = get_bits(gb, 2);
                if (v->mv_mode)
                av_log(v->s.avctx, AV_LOG_ERROR,
                       "mv_mode for lowquant B frame was %i\n", v->mv_mode);
            }
        }
        else
        {
            if (!v->mv_mode)
            {
                if (get_bits(gb, 1))
                     av_log(v->s.avctx, AV_LOG_ERROR,
                            "mv_mode for highquant B frame was %i\n", v->mv_mode);
            }
            v->mv_mode = 1-v->mv_mode; //To match (pq < 13) mapping
        }
    }

    return 0;
}

/** B and BI frame header decoding, secondary part
 * @see Tables 11+12, p62-65
 * @param v VC9 context
 * @return Status
 * @warning Also handles BI frames
 * @warning To call once all MB arrays are allocated
 * @todo Support Advanced Profile headers
 */
static int decode_b_picture_secondary_header(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    int status;

    status = bitplane_decoding(&v->skip_mb_plane, v);
    if (status < 0) return -1;
#if TRACE
    if (v->mv_mode == MV_PMODE_MIXED_MV)
    {
        status = bitplane_decoding(&v->mv_type_mb_plane, v);
        if (status < 0)
            return -1;
#if TRACE
        av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "
               "Imode: %i, Invert: %i\n", status>>1, status&1);
#endif
    }

    //bitplane
    status = bitplane_decoding(&v->direct_mb_plane, v);
    if (status < 0) return -1;
#if TRACE
    av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct plane encoding: "
           "Imode: %i, Invert: %i\n", status>>1, status&1);
#endif

    av_log(v->s.avctx, AV_LOG_DEBUG, "Skip MB plane encoding: "
           "Imode: %i, Invert: %i\n", status>>1, status&1);
#endif

    /* FIXME: what is actually chosen for B frames ? */
    v->s.mv_table_index = get_bits(gb, 2); //but using vc9_ tables
    v->cbpcy_vlc = &vc9_cbpcy_p_vlc[get_bits(gb, 2)];

    if (v->dquant)
    {
        vop_dquant_decoding(v);
    }

    if (v->vstransform)
    {
        v->ttmbf = get_bits(gb, 1);
        if (v->ttmbf)
        {
            v->ttfrm = get_bits(gb, 2);
            av_log(v->s.avctx, AV_LOG_INFO, "Transform used: %ix%i\n",
                   (v->ttfrm & 2) ? 4 : 8, (v->ttfrm & 1) ? 4 : 8);
        }
    }
    /* Epilog (AC/DC syntax) should be done in caller */
    return 0;
}

/** I frame header decoding, primary part
 * @see Tables 5+7, p53-54 and 55-57
 * @param v VC9 context
 * @return Status
 * @todo Support Advanced Profile headers
 */
static int decode_i_picture_primary_header(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    int pqindex;

    /* Prolog common to all frametypes should be done in caller */
    //BF = Buffer Fullness
    if (v->profile < PROFILE_ADVANCED && get_bits(gb, 7))
    {
        av_log(v->s.avctx, AV_LOG_DEBUG, "I BufferFullness not 0\n");
    }

    /* Quantizer stuff */
    pqindex = get_bits(gb, 5);
    if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
        v->pq = pquant_table[0][pqindex];
    else
    {
        v->pq = pquant_table[v->quantizer_mode-1][pqindex];
    }
    if (pqindex < 9) v->halfpq = get_bits(gb, 1);
    if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
        v->pquantizer = get_bits(gb, 1);
    av_log(v->s.avctx, AV_LOG_DEBUG, "I frame: QP=%i (+%i/2)\n",
           v->pq, v->halfpq);
    return 0;
}

/** I frame header decoding, secondary part
 * @param v VC9 context
 * @return Status
 * @todo Support Advanced Profile headers
 */
static int decode_i_picture_secondary_header(VC9Context *v)
{
    int status;
#if HAS_ADVANCED_PROFILE
    if (v->profile == PROFILE_ADVANCED)
    {
        v->s.ac_pred = get_bits(&v->s.gb, 1);
        if (v->postprocflag) v->postproc = get_bits(&v->s.gb, 1);
        /* 7.1.1.34 + 8.5.2 */
        if (v->overlap && v->pq<9)
        {
            v->condover = get_bits(&v->s.gb, 1);
            if (v->condover)
            {
                v->condover = 2+get_bits(&v->s.gb, 1);
                if (v->condover == 3)
                {
                    status = bitplane_decoding(&v->over_flags_plane, v);
                    if (status < 0) return -1;
#  if TRACE
                    av_log(v->s.avctx, AV_LOG_DEBUG, "Overflags plane encoding: "
                           "Imode: %i, Invert: %i\n", status>>1, status&1);
#  endif
                }
            }
        }
    }
#endif

    /* Epilog (AC/DC syntax) should be done in caller */
    return 0;
}

/** P frame header decoding, primary part
 * @see Tables 5+7, p53-54 and 55-57
 * @param v VC9 context
 * @todo Support Advanced Profile headers
 * @return Status
 */
static int decode_p_picture_primary_header(VC9Context *v)
{
    /* INTERFRM, FRMCNT, RANGEREDFRM read in caller */
    GetBitContext *gb = &v->s.gb;
    int lowquant, pqindex;

    pqindex = get_bits(gb, 5);
    if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
        v->pq = pquant_table[0][pqindex];
    else
    {
        v->pq = pquant_table[v->quantizer_mode-1][pqindex];
    }
    if (pqindex < 9) v->halfpq = get_bits(gb, 1);
    if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
        v->pquantizer = get_bits(gb, 1);
    av_log(v->s.avctx, AV_LOG_DEBUG, "P Frame: QP=%i (+%i/2)\n",
           v->pq, v->halfpq);
    if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);
#if HAS_ADVANCED_PROFILE
    if (v->profile == PROFILE_ADVANCED)
    {
        if (v->postprocflag) v->postproc = get_bits(gb, 1);
    }
    else
#endif
        if (v->multires) v->respic = get_bits(gb, 2);
    lowquant = (v->pquantizer>12) ? 0 : 1;
    v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];
    if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
    {
        v->mv_mode2 = mv_pmode_table[lowquant][get_prefix(gb, 1, 3)];
        v->lumscale = get_bits(gb, 6);
        v->lumshift = get_bits(gb, 6);
    }
    return 0;
}

/** P frame header decoding, secondary part
 * @see Tables 5+7, p53-54 and 55-57
 * @param v VC9 context
 * @warning To call once all MB arrays are allocated
 * @return Status
 */
static int decode_p_picture_secondary_header(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    int status = 0;
    if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
         v->mv_mode2 == MV_PMODE_MIXED_MV)
        || v->mv_mode == MV_PMODE_MIXED_MV)
    {
        status = bitplane_decoding(&v->mv_type_mb_plane, v);
        if (status < 0) return -1;
#if TRACE
        av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "
               "Imode: %i, Invert: %i\n", status>>1, status&1);
#endif
    }

    status = bitplane_decoding(&v->skip_mb_plane, v);
    if (status < 0) return -1;
#if TRACE
    av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
           "Imode: %i, Invert: %i\n", status>>1, status&1);
#endif

    /* Hopefully this is correct for P frames */
    v->s.mv_table_index =get_bits(gb, 2); //but using vc9_ tables
    v->cbpcy_vlc = &vc9_cbpcy_p_vlc[get_bits(gb, 2)];

    if (v->dquant)
    {
        av_log(v->s.avctx, AV_LOG_INFO, "VOP DQuant info\n");
        vop_dquant_decoding(v);
    }

    v->ttfrm = 0; //FIXME Is that so ?
    if (v->vstransform)
    {
        v->ttmbf = get_bits(gb, 1);
        if (v->ttmbf)
        {
            v->ttfrm = get_bits(gb, 2);
            av_log(v->s.avctx, AV_LOG_INFO, "Transform used: %ix%i\n",
                   (v->ttfrm & 2) ? 4 : 8, (v->ttfrm & 1) ? 4 : 8);
        }
    }
    /* Epilog (AC/DC syntax) should be done in caller */
    return 0;
}
/** @} */ //End of group all_frm_hdr


/***********************************************************************/
/** 
 * @defgroup std_frame_hdr VC9 Simple/Main Profiles header decoding
 * @brief Part of the frame header decoding belonging to Simple/Main Profiles
 * @warning Only pro/epilog differs between Simple/Main and Advanced =>
 *          check caller
 * @{
 */

/** Frame header decoding, first part, in Simple and Main profiles
 * @see Tables 5+7, p53-54 and 55-57
 * @param v VC9 context
 * @todo FIXME: RANGEREDFRM element not read if BI frame from Table6, P54
 *              However, 7.1.1.8 says "all frame types, for main profiles"
 * @return Status
 */
static int standard_decode_picture_primary_header(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    int status = 0;

    if (v->finterpflag) v->interpfrm = get_bits(gb, 1);
    skip_bits(gb, 2); //framecnt unused
    if (v->rangered) v->rangeredfrm = get_bits(gb, 1);
    v->s.pict_type = get_bits(gb, 1);
    if (v->s.avctx->max_b_frames)
    {
        if (!v->s.pict_type)
        {
            if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;
            else v->s.pict_type = B_TYPE;
        }
        else v->s.pict_type = P_TYPE;
    }
    else v->s.pict_type++;

    switch (v->s.pict_type)
    {
    case I_TYPE: status = decode_i_picture_primary_header(v); break;
    case P_TYPE: status = decode_p_picture_primary_header(v); break;
    case BI_TYPE: //Same as B
    case B_TYPE: status = decode_b_picture_primary_header(v); break;
    }

    if (status == FRAME_SKIPED)
    {
      av_log(v->s.avctx, AV_LOG_INFO, "Skipping frame...\n");
      return status;
    }
    return 0;
}

/** Frame header decoding, secondary part
 * @param v VC9 context
 * @warning To call once all MB arrays are allocated
 * @return Status
 */
static int standard_decode_picture_secondary_header(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    int status = 0;

    switch (v->s.pict_type)
    {
    case P_TYPE: status = decode_p_picture_secondary_header(v); break;
    case B_TYPE: status = decode_b_picture_secondary_header(v); break;
    case BI_TYPE:
    case I_TYPE: break; //Nothing needed as it's done in the epilog
    }
    if (status < 0) return FRAME_SKIPED;

    /* AC Syntax */
    v->ac_table_level = decode012(gb);
    if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
    {
        v->ac2_table_level = decode012(gb);
    }
    /* DC Syntax */
    v->s.dc_table_index = decode012(gb);

    return 0;
}
/** @} */ //End for group std_frame_hdr

#if HAS_ADVANCED_PROFILE
/***********************************************************************/
/** 
 * @defgroup adv_frame_hdr VC9 Advanced Profile header decoding
 * @brief Part of the frame header decoding belonging to Advanced Profiles
 * @warning Only pro/epilog differs between Simple/Main and Advanced =>
 *          check caller
 * @{
 */
/** Frame header decoding, primary part
 * @param v VC9 context
 * @return Status
 */
static int advanced_decode_picture_primary_header(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    static const int type_table[4] = { P_TYPE, B_TYPE, I_TYPE, BI_TYPE };
    int type;

    if (v->interlace)
    {
        v->fcm = get_bits(gb, 1);
        if (v->fcm) v->fcm = 2+get_bits(gb, 1);
    }

    type = get_prefix(gb, 0, 4);
    if (type > 4 || type < 0) return FRAME_SKIPED;
    v->s.pict_type = type_table[type];
    av_log(v->s.avctx, AV_LOG_INFO, "AP Frame Type: %i\n", v->s.pict_type);

    if (v->tfcntrflag) v->tfcntr = get_bits(gb, 8);
    if (v->broadcast)
    {
        if (!v->interlace) v->rptfrm = get_bits(gb, 2);
        else
        {
            v->tff = get_bits(gb, 1);
            v->rff = get_bits(gb, 1);
        }
    }

    if (v->panscanflag)
    {
#if 0
        for (i=0; i<v->numpanscanwin; i++)
        {
            v->topleftx[i] = get_bits(gb, 16);
            v->toplefty[i] = get_bits(gb, 16);
            v->bottomrightx[i] = get_bits(gb, 16);
            v->bottomrighty[i] = get_bits(gb, 16);
        }
#else
        skip_bits(gb, 16*4*v->numpanscanwin);
#endif
    }
    v->s.no_rounding = !get_bits(gb, 1);
    v->uvsamp = get_bits(gb, 1);
    if (v->finterpflag == 1) v->interpfrm = get_bits(gb, 1);

    switch(v->s.pict_type)
    {
    case I_TYPE: if (decode_i_picture_primary_header(v) < 0) return -1;
    case P_TYPE: if (decode_p_picture_primary_header(v) < 0) return -1;
    case BI_TYPE:
    case B_TYPE: if (decode_b_picture_primary_header(v) < 0) return FRAME_SKIPED;
    default: return -1;
    }
}

/** Frame header decoding, secondary part
 * @param v VC9 context
 * @return Status
 */
static int advanced_decode_picture_secondary_header(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    int status = 0;

    switch(v->s.pict_type)
    {
    case P_TYPE: status = decode_p_picture_secondary_header(v); break;
    case B_TYPE: status = decode_b_picture_secondary_header(v); break;
    case BI_TYPE:
    case I_TYPE: status = decode_i_picture_secondary_header(v); break; 
    }
    if (status<0) return FRAME_SKIPED;

    /* AC Syntax */
    v->ac_table_level = decode012(gb);
    if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
    {
        v->ac2_table_level = decode012(gb);
    }
    /* DC Syntax */
    v->s.dc_table_index = decode012(gb);

    return 0;
}
#endif
/** @} */ //End for adv_frame_hdr

/***********************************************************************/
/** 
 * @defgroup block VC9 Block-level functions
 * @see 7.1.4, p91 and 8.1.1.7, p(1)04
 * @todo TODO: Integrate to MpegEncContext facilities
 * @{
 */

/**
 * @def GET_MQUANT
 * @brief Get macroblock-level quantizer scale
 */
#define GET_MQUANT()                                           \
  if (v->dquantfrm)                                            \
  {                                                            \
    if (v->dqprofile == DQPROFILE_ALL_MBS)                     \
    {                                                          \
      if (v->dqbilevel)                                        \
      {                                                        \
        mquant = (get_bits(gb, 1)) ? v->pq : v->altpq;         \
      }                                                        \
      else                                                     \
      {                                                        \
        mqdiff = get_bits(gb, 3);                              \
        if (mqdiff != 7) mquant = v->pq + mqdiff;              \
        else mquant = get_bits(gb, 5);                         \
      }                                                        \
    }                                                          \
  }

/**
 * @def GET_MVDATA(_dmv_x, _dmv_y)
 * @brief Get MV differentials
 * @see MVDATA decoding from 8.3.5.2, p(1)20
 * @param dmv_x Horizontal differential for decoded MV
 * @param dmv_y Vertical differential for decoded MV
 */
#define GET_MVDATA(_dmv_x, _dmv_y)                                  \
  index = 1 + get_vlc2(gb, vc9_mv_diff_vlc[s->mv_table_index].table,\
                       VC9_MV_DIFF_VLC_BITS, 2);                    \
  if (index > 36)                                                   \
  {                                                                 \
    mb_has_coeffs = 1;                                              \
    index -= 37;                                                    \
  }                                                                 \
  else mb_has_coeffs = 0;                                           \
  s->mb_intra = 0;                                                  \
  if (!index) { _dmv_x = _dmv_y = 0; }                              \
  else if (index == 35)                                             \
  {                                                                 \
    _dmv_x = get_bits(gb, v->k_x);                                  \
    _dmv_y = get_bits(gb, v->k_y);                                  \
    s->mb_intra = 1;                                                \
  }                                                                 \
  else                                                              \
  {                                                                 \
    index1 = index%6;                                               \
    if (s->mspel && index1 == 5) val = 1;                           \
    else                         val = 0;                           \
    val = get_bits(gb, size_table[index1] - val);                   \
    sign = 0 - (val&1);                                             \
    _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \
                                                                    \
    index1 = index/6;                                               \
    if (s->mspel && index1 == 5) val = 1;                           \
    else                          val = 0;                          \
    val = get_bits(gb, size_table[index1] - val);                   \
    sign = 0 - (val&1);                                             \
    _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \
  }

/** Get predicted DC value
 * prediction dir: left=0, top=1
 */
static inline int vc9_pred_dc(MpegEncContext *s, int n, 
                              uint16_t **dc_val_ptr, int *dir_ptr)
{
    int a, b, c, wrap, pred, scale;
    int16_t *dc_val;

    /* find prediction */
    if (n < 4) {
	scale = s->y_dc_scale;
    } else {
	scale = s->c_dc_scale;
    }
    
    wrap = s->block_wrap[n];
    dc_val= s->dc_val[0] + s->block_index[n];

    /* B C
     * A X 
     */
    a = dc_val[ - 1];
    b = dc_val[ - 1 - wrap];
    c = dc_val[ - wrap];
    
    if(s->first_slice_line && (n&2)==0) b=c=1024;

    /* XXX: the following solution consumes divisions, but it does not
       necessitate to modify mpegvideo.c. The problem comes from the
       fact they decided to store the quantized DC (which would lead
       to problems if Q could vary !) */
#if (defined(ARCH_X86) || defined(ARCH_X86_64)) && !defined PIC
    asm volatile(
        "movl %3, %%eax		\n\t"
	"shrl $1, %%eax		\n\t"
	"addl %%eax, %2		\n\t"
	"addl %%eax, %1		\n\t"
	"addl %0, %%eax		\n\t"
	"mull %4		\n\t"
	"movl %%edx, %0		\n\t"
	"movl %1, %%eax		\n\t"
	"mull %4		\n\t"
	"movl %%edx, %1		\n\t"
	"movl %2, %%eax		\n\t"
	"mull %4		\n\t"
	"movl %%edx, %2		\n\t"
	: "+b" (a), "+c" (b), "+D" (c)
	: "g" (scale), "S" (inverse[scale])
	: "%eax", "%edx"
    );
#else
    /* #elif defined (ARCH_ALPHA) */
    /* Divisions are extremely costly on Alpha; optimize the most
       common case. But they are costly everywhere...
     */
    if (scale == 8) {
	a = (a + (8 >> 1)) / 8;
	b = (b + (8 >> 1)) / 8;
	c = (c + (8 >> 1)) / 8;
    } else {
	a = FASTDIV((a + (scale >> 1)), scale);
	b = FASTDIV((b + (scale >> 1)), scale);
	c = FASTDIV((c + (scale >> 1)), scale);
    }
#endif

    if (abs(a - b) <= abs(b - c)) {
        pred = c;
        *dir_ptr = 1;
    } else {
        pred = a;
        *dir_ptr = 0;
    }

    /* update predictor */
    *dc_val_ptr = &dc_val[0];
    return pred;
}

/** Decode one block, inter or intra
 * @param v The VC9 context
 * @param block 8x8 DCT block
 * @param n Block index in the current MB (<4=>luma)
 * @param coded If the block is coded
 * @param MB quant, if decoded at the MB layer
 * @see Inter TT: Table 21, p73 + p91-85
 * @see Intra TT: Table 20, p72 + p(1)05-(1)07
 * @todo TODO: Process the blocks
 * @todo TODO: Use M$ MPEG-4 cbp prediction
 */
int vc9_decode_block(VC9Context *v, DCTELEM block[64], int n, int coded, int mquant)
{
    GetBitContext *gb = &v->s.gb;
    MpegEncContext *s = &v->s;
    int ttblk; /* Transform Type per Block */
    int subblkpat; /* Sub-block Transform Type Pattern */
    int dc_pred_dir; /* Direction of the DC prediction used */
    int run_diff, i;

    if (s->mb_intra)
    {
        int dcdiff;
        uint16_t *dc_val;

        /* Get DC differential */
        if (n < 4) {
            dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
        } else {
            dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
        }
        if (dcdiff < 0){
            av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
            return -1;
        }
        if (dcdiff)
        {
            if (dcdiff == 119 /* ESC index value */)
            {
                /* TODO: Optimize */
                if (mquant == 1) dcdiff = get_bits(gb, 10);
                else if (mquant == 2) dcdiff = get_bits(gb, 9);
                else dcdiff = get_bits(gb, 8);
            }
            else
            {
                if (mquant == 1)
                  dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;
                else if (mquant == 2)
                  dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;
            }
            if (get_bits(gb, 1))
              dcdiff = -dcdiff;
        }

        /* Prediction */
        dcdiff += vc9_pred_dc(s, n, &dc_val, &dc_pred_dir);
        if (n < 4) {
            *dc_val = dcdiff * s->y_dc_scale;
        } else {
            *dc_val = dcdiff * s->c_dc_scale;
        }
        if (dcdiff < 0)
        {
            av_log(s->avctx, AV_LOG_ERROR, "DC=%i<0\n", dcdiff);
            return -1;
        }
        block[0] = dcdiff; //XXX: Must be > 0
        
        /* Skip ? */
        run_diff = 0;
        i = 0;
        if (!coded) {
            goto not_coded;
        }
    }
    else
    {
        mquant = v->pq;

        /* Get TTBLK */
        if (v->ttmb < 8) /* per block */
            ttblk = get_vlc2(gb, vc9_ttblk_vlc[v->tt_index].table, VC9_TTBLK_VLC_BITS, 2);
        else /* Per frame */
          ttblk = 0; //FIXME, depends on ttfrm

        /* Get SUBBLKPAT */
        if (ttblk == v->ttblk4x4) /* 4x4 transform for that qp value */
            subblkpat = 1+get_vlc2(gb, vc9_subblkpat_vlc[v->tt_index].table,
                                   VC9_SUBBLKPAT_VLC_BITS, 2);
        else /* All others: 8x8, 4x8, 8x4 */
            subblkpat = decode012(gb);
    }

    //TODO AC Decoding


 not_coded:
    if (s->mb_intra) {
        mpeg4_pred_ac(s, block, n, dc_pred_dir);
        if (s->ac_pred) {
            i = 63; /* XXX: not optimal */
        }
    }
    if(i>0) i=63; //FIXME/XXX optimize
    s->block_last_index[n] = i;
    return 0;
}

/** @} */ //End for group block

/***********************************************************************/
/** 
 * @defgroup std_mb VC9 Macroblock-level functions in Simple/Main Profiles
 * @see 7.1.4, p91 and 8.1.1.7, p(1)04
 * @todo TODO: Integrate to MpegEncContext facilities
 * @{
 */

static inline int vc9_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)
{
    int xy, wrap, pred, a, b, c;

    xy = s->block_index[n];
    wrap = s->b8_stride;

    /* B C
     * A X 
     */
    a = s->coded_block[xy - 1       ];
    b = s->coded_block[xy - 1 - wrap];
    c = s->coded_block[xy     - wrap];
    
    if (b == c) {
        pred = a;
    } else {
        pred = c;
    }
    
    /* store value */
    *coded_block_ptr = &s->coded_block[xy];

    return pred;
}

int vc9_decode_i_mb(VC9Context *v, DCTELEM block[6][64])
{
    int i, cbp, val;
    uint8_t *coded_val;
    uint32_t * const mb_type_ptr= &v->s.current_picture.mb_type[ v->s.mb_x + v->s.mb_y*v->s.mb_stride ];

    v->s.mb_intra = 1;
    cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
    if (cbp < 0) return -1;
    v->s.ac_pred = get_bits(&v->s.gb, 1);

    for (i=0; i<6; i++)
    {
        val = ((cbp >> (5 - i)) & 1);
        if (i < 4) {
            int pred = vc9_coded_block_pred(&v->s, i, &coded_val);
            val = val ^ pred;
            *coded_val = val;
        }
        cbp |= val << (5 - i);
        if (vc9_decode_block(v, block[i], i, val, v->pq) < 0) //FIXME Should be mquant
	{
	    av_log(v->s.avctx, AV_LOG_ERROR,
                   "\nerror while decoding block: %d x %d (%d)\n", v->s.mb_x, v->s.mb_y, i);
	    return -1;
	}
    }
    return 0;
}

int vc9_decode_p_mb(VC9Context *v, DCTELEM block[6][64])
{
    MpegEncContext *s = &v->s;
    GetBitContext *gb = &s->gb;
    int i, mb_offset = s->mb_x + s->mb_y*s->mb_width; /* XXX: mb_stride */
    int cbp; /* cbp decoding stuff */
    int hybrid_pred; /* Prediction types */
    int mv_mode_bit = 0; 
    int mqdiff, mquant; /* MB quantization */
    int ttmb; /* MB Transform type */
    int status;
    uint8_t *coded_val;

    static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },
      offset_table[6] = { 0, 1, 3, 7, 15, 31 };
    int mb_has_coeffs = 1; /* last_flag */
    int dmv_x, dmv_y; /* Differential MV components */
    int index, index1; /* LUT indices */
    int val, sign; /* temp values */

    if (v->mv_type_mb_plane.is_raw)
        v->mv_type_mb_plane.data[mb_offset] = get_bits(gb, 1);
    if (v->skip_mb_plane.is_raw)
        v->skip_mb_plane.data[mb_offset] = get_bits(gb, 1);
    if (!mv_mode_bit) /* 1MV mode */
    {
        if (!v->skip_mb_plane.data[mb_offset])
        {
            GET_MVDATA(dmv_x, dmv_y);
            
            /* hybrid mv pred, 8.3.5.3.4 */
            if (v->mv_mode == MV_PMODE_1MV ||
                v->mv_mode == MV_PMODE_MIXED_MV)
                hybrid_pred = get_bits(gb, 1);
            if (s->mb_intra && !mb_has_coeffs)
            {
                GET_MQUANT();
                s->ac_pred = get_bits(gb, 1);
                /* XXX: how to handle cbp ? */
            }
            else if (mb_has_coeffs)
            {
                if (s->mb_intra) s->ac_pred = get_bits(gb, 1);
                cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC9_CBPCY_P_VLC_BITS, 2);
                GET_MQUANT();
            }
            else
            {
                mquant = v->pq;
                /* XXX: How to handle cbp ? */
            }

            if (!v->ttmbf)
                ttmb = get_vlc2(gb, vc9_ttmb_vlc[v->tt_index].table,
                                VC9_TTMB_VLC_BITS, 12);
            for (i=0; i<6; i++)
            {
                val = ((cbp >> (5 - i)) & 1);
                if (i < 4) {
                    int pred = vc9_coded_block_pred(&v->s, i, &coded_val);
                    val = val ^ pred;
                    *coded_val = val;
                }
                vc9_decode_block(v, block[i], i, val, mquant); //FIXME
            }
        }
        else //Skipped
        {
            /* hybrid mv pred, 8.3.5.3.4 */
            if (v->mv_mode == MV_PMODE_1MV ||
                v->mv_mode == MV_PMODE_MIXED_MV)
                hybrid_pred = get_bits(gb, 1);

            /* TODO: blah */
            return 0;
        }
    } //1MV mode
    else //4MV mode
    {
        if (!v->skip_mb_plane.data[mb_offset] /* unskipped MB */)
        {
            /* Get CBPCY */
            cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC9_CBPCY_P_VLC_BITS, 2);
            for (i=0; i<6; i++)
            {
                val = ((cbp >> (5 - i)) & 1);
                if (i < 4) {
                    int pred = vc9_coded_block_pred(&v->s, i, &coded_val);
                    val = val ^ pred;
                    *coded_val = val;
                }
                if (i<4 && val)
                {
                    GET_MVDATA(dmv_x, dmv_y);
                }
                if (v->mv_mode == MV_PMODE_MIXED_MV /* Hybrid pred */)
                    hybrid_pred = get_bits(gb, 1);
                GET_MQUANT();
                if (s->mb_intra /* One of the 4 blocks is intra */ &&
                    index /* non-zero pred for that block */)
                    s->ac_pred = get_bits(gb, 1);
                if (!v->ttmbf)
                    ttmb = get_vlc2(gb, vc9_ttmb_vlc[v->tt_index].table,
                                    VC9_TTMB_VLC_BITS, 12);
                status = vc9_decode_block(v, block[i], i, val, mquant);
            }
            return status;
        }
        else //Skipped MB
        {
            for (i=0; i<4; i++)
            {
                if (v->mv_mode == MV_PMODE_MIXED_MV /* Hybrid pred */)
                    hybrid_pred = get_bits(gb, 1);
                vc9_decode_block(v, block[i], i, 0 /*cbp[i]*/, mquant); //FIXME
            }
            /* TODO: blah */
            return 0;
        }
    }
    
    /* Should never happen */
    return -1;
}

int vc9_decode_b_mb(VC9Context *v, DCTELEM block[6][64])
{
    int i;
    //Decode CBP
    for (i=0; i<6; i++)
    {
        vc9_decode_block(v, block[i], i, 0 /*cbp[i]*/, v->pq /*Should be mquant*/); //FIXME
    }
    return 0;
}

static int standard_decode_mbs(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    MpegEncContext *s = &v->s;
    
    /* Set transform type info depending on pq */
    if (v->pq < 5)
    {
        v->tt_index = 0;
        v->ttblk4x4 = 3;
    }
    else if (v->pq < 13)
    {
        v->tt_index = 1;
        v->ttblk4x4 = 3;
    }
    else
    {
        v->tt_index = 2;
        v->ttblk4x4 = 2;
    }
    
    if (s->pict_type != I_TYPE)
    {
        /* Select proper long MV range */
        switch (v->mvrange)
        {
        case 1: v->k_x = 10; v->k_y = 9; break;
        case 2: v->k_x = 12; v->k_y = 10; break;
        case 3: v->k_x = 13; v->k_y = 11; break;
        default: /*case 0 too */ v->k_x = 9; v->k_y = 8; break;
        }

        s->mspel = v->mv_mode & 1; //MV_PMODE is HPEL
        v->k_x -= s->mspel;
        v->k_y -= s->mspel;
    }

    for (s->mb_y=0; s->mb_y<s->mb_height; s->mb_y++)
    {
        for (s->mb_x=0; s->mb_x<s->mb_width; s->mb_x++)
        {
            //FIXME Get proper MB DCTELEM
            //TODO Move out of the loop
            switch (s->pict_type)
            {
            case I_TYPE: vc9_decode_i_mb(v, NULL); break;
            case P_TYPE: vc9_decode_i_mb(v, NULL); break;
            case BI_TYPE:
            case B_TYPE: vc9_decode_i_mb(v, NULL); break;
            }
        }
        //Add a check for overconsumption ?
    }
    return 0;
}


/**
 * @def GET_CBPCY(table, bits)
 * @brief Get the Coded Block Pattern for luma and chroma
 * @param table VLC table to use (get_vlc2 second parameter)
 * @param bits Average bitlength (third parameter to get_vlc2)
 * @see  8.1.1.5, p(1)02-(1)03
 */
#define GET_CBPCY(table, bits)                                      \
    predicted_cbpcy = get_vlc2(gb, table, bits, 2);             \
    cbpcy[0] = (p_cbpcy[-1] == p_cbpcy[2])                          \
         ? previous_cbpcy[1] : p_cbpcy[+2];                         \
    cbpcy[0] ^= ((predicted_cbpcy>>5)&0x01);                        \
    cbpcy[1] = (p_cbpcy[2] == p_cbpcy[3]) ? cbpcy[0] : p_cbpcy[3];  \
    cbpcy[1] ^= ((predicted_cbpcy>>4)&0x01);                        \
    cbpcy[2] = (previous_cbpcy[1] == cbpcy[0])                      \
         ? previous_cbpcy[3] : cbpcy[0];                            \
    cbpcy[2] ^= ((predicted_cbpcy>>3)&0x01);                        \
    cbpcy[3] = (cbpcy[1] == cbpcy[0]) ? cbpcy[2] : cbpcy[1];        \
    cbpcy[3] ^= ((predicted_cbpcy>>2)&0x01);

/** Decode all MBs for an I frame in Simple/Main profile
 * @see 8.1, p100
 * @todo TODO: Process the blocks
 * @todo TODO: Use M$ MPEG-4 cbp prediction
 */
static int standard_decode_i_mbs(VC9Context *v)
{
    GetBitContext *gb = &v->s.gb;
    MpegEncContext *s = &v->s;
    int mb_offset = 0; /* MB/Block Position info */
    uint8_t cbpcy[4], previous_cbpcy[4], predicted_cbpcy,
        *p_cbpcy /* Pointer to skip some math */;

    /* Reset CBPCY predictors */
    memset(v->previous_line_cbpcy, 0, s->mb_stride<<2);

    /* Select ttmb table depending on pq */
    if (v->pq < 5)
    {
        v->tt_index = 0;
        v->ttblk4x4 = 3;
    }
    else if (v->pq < 13)
    {
        v->tt_index = 1;
        v->ttblk4x4 = 3;
    }
    else
    {
        v->tt_index = 2;
        v->ttblk4x4 = 2;
    }

    for (s->mb_y=0; s->mb_y<s->mb_height; s->mb_y++)
    {
        /* Init CBPCY for line */
        *((uint32_t*)previous_cbpcy) = 0x00000000;
        p_cbpcy = v->previous_line_cbpcy+4;

        for (s->mb_x=0; s->mb_x<s->mb_width; s->mb_x++, p_cbpcy += 4)
        {
            /* Get CBPCY */
            GET_CBPCY(ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS);

            s->ac_pred = get_bits(gb, 1);

            /* TODO: Decode blocks from that mb wrt cbpcy */

            /* Update for next block */
#if TRACE > 2
            av_log(s->avctx, AV_LOG_DEBUG, "Block %4i: p_cbpcy=%i%i%i%i, previous_cbpcy=%i%i%i%i,"
                   " cbpcy=%i%i%i%i\n", mb_offset,
                   p_cbpcy[0], p_cbpcy[1], p_cbpcy[2], p_cbpcy[3],
                   previous_cbpcy[0], previous_cbpcy[1], previous_cbpcy[2], previous_cbpcy[3],
                   cbpcy[0], cbpcy[1], cbpcy[2], cbpcy[3]);
#endif
            *((uint32_t*)p_cbpcy) = *((uint32_t*)previous_cbpcy);
            *((uint32_t*)previous_cbpcy) = *((uint32_t*)cbpcy);
            mb_offset++;
        }
    }
    return 0;
}


/** Decode all MBs for an P frame in Simple/Main profile
 * @see 8.1, p(1)15
 * @todo TODO: Process the blocks
 * @todo TODO: Use M$ MPEG-4 cbp prediction
 */
static int decode_p_mbs(VC9Context *v)
{
    MpegEncContext *s = &v->s;
    GetBitContext *gb = &v->s.gb;
    int mb_offset = 0, i; /* MB/Block Position info */
    uint8_t cbpcy[4], previous_cbpcy[4], predicted_cbpcy,
        *p_cbpcy /* Pointer to skip some math */;
    int hybrid_pred; /* Prediction types */
    int mv_mode_bit = 0; 
    int mqdiff, mquant; /* MB quantization */
    int ttmb; /* MB Transform type */

    static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },
        offset_table[6] = { 0, 1, 3, 7, 15, 31 };
        int mb_has_coeffs = 1; /* last_flag */
    int dmv_x, dmv_y; /* Differential MV components */
    int index, index1; /* LUT indices */
    int val, sign; /* MVDATA temp values */

    /* Select ttmb table depending on pq */
    if (v->pq < 5)
    {
        v->tt_index = 0;
        v->ttblk4x4 = 3;
    }
    else if (v->pq < 13)
    {
        v->tt_index = 1;
        v->ttblk4x4 = 3;
    }
    else
    {
        v->tt_index = 2;
        v->ttblk4x4 = 2;
    }

    /* Select proper long MV range */
    switch (v->mvrange)
    {
    case 1: v->k_x = 10; v->k_y = 9; break;
    case 2: v->k_x = 12; v->k_y = 10; break;
    case 3: v->k_x = 13; v->k_y = 11; break;
    default: /*case 0 too */ v->k_x = 9; v->k_y = 8; break;
    }

    s->mspel = v->mv_mode & 1; //MV_PMODE is HPEL
    v->k_x -= s->mspel;
    v->k_y -= s->mspel;

    /* Reset CBPCY predictors */
    memset(v->previous_line_cbpcy, 0, s->mb_stride<<2);

    for (s->mb_y=0; s->mb_y<s->mb_height; s->mb_y++)
    {
        /* Init CBPCY for line */
        *((uint32_t*)previous_cbpcy) = 0x00000000;
        p_cbpcy = v->previous_line_cbpcy+4;

        for (s->mb_x=0; s->mb_x<s->mb_width; s->mb_x++, p_cbpcy += 4)
        {
            if (v->mv_type_mb_plane.is_raw)
                v->mv_type_mb_plane.data[mb_offset] = get_bits(gb, 1);
            if (v->skip_mb_plane.is_raw)
                v->skip_mb_plane.data[mb_offset] = get_bits(gb, 1);
            if (!mv_mode_bit) /* 1MV mode */
            {
                if (!v->skip_mb_plane.data[mb_offset])
                {
                    GET_MVDATA(dmv_x, dmv_y);

                    /* hybrid mv pred, 8.3.5.3.4 */
                    if (v->mv_mode == MV_PMODE_1MV ||
                        v->mv_mode == MV_PMODE_MIXED_MV)
                        hybrid_pred = get_bits(gb, 1);
                    if (s->mb_intra && !mb_has_coeffs)
                    {
                        GET_MQUANT();
                        s->ac_pred = get_bits(gb, 1);
                    }
                    else if (mb_has_coeffs)
                    {
                        if (s->mb_intra) s->ac_pred = get_bits(gb, 1);
                        predicted_cbpcy = get_vlc2(gb, v->cbpcy_vlc->table, VC9_CBPCY_P_VLC_BITS, 2);
                        GET_CBPCY(v->cbpcy_vlc->table, VC9_CBPCY_P_VLC_BITS);

                        GET_MQUANT();
                    }
                    if (!v->ttmbf)
                        ttmb = get_vlc2(gb, vc9_ttmb_vlc[v->tt_index].table,
                                            VC9_TTMB_VLC_BITS, 12);
                    /* TODO: decode blocks from that mb wrt cbpcy */
                }
                else //Skipped
                {
                    /* hybrid mv pred, 8.3.5.3.4 */
                    if (v->mv_mode == MV_PMODE_1MV ||
                        v->mv_mode == MV_PMODE_MIXED_MV)
                        hybrid_pred = get_bits(gb, 1);
                }
            } //1MV mode
            else //4MV mode
            {
              if (!v->skip_mb_plane.data[mb_offset] /* unskipped MB */)
                {
                    /* Get CBPCY */
                    GET_CBPCY(v->cbpcy_vlc->table, VC9_CBPCY_P_VLC_BITS);
                    for (i=0; i<4; i++) //For all 4 Y blocks
                    {
                        if (cbpcy[i] /* cbpcy set for this block */)
                        {
                            GET_MVDATA(dmv_x, dmv_y);
                        }
                        if (v->mv_mode == MV_PMODE_MIXED_MV /* Hybrid pred */)
                            hybrid_pred = get_bits(gb, 1);
                        GET_MQUANT();
                        if (s->mb_intra /* One of the 4 blocks is intra */ &&
                            index /* non-zero pred for that block */)
                            s->ac_pred = get_bits(gb, 1);
                        if (!v->ttmbf)
                            ttmb = get_vlc2(gb, vc9_ttmb_vlc[v->tt_index].table,
                                            VC9_TTMB_VLC_BITS, 12);
            
                        /* TODO: Process blocks wrt cbpcy */
            
                    }
                }
                else //Skipped MB
                {
                    for (i=0; i<4; i++) //All 4 Y blocks
                    {
                        if (v->mv_mode == MV_PMODE_MIXED_MV /* Hybrid pred */)
                            hybrid_pred = get_bits(gb, 1);
                        
                        /* TODO: do something */
                    }
                }
            }

            /* Update for next block */
#if TRACE > 2
            av_log(s->avctx, AV_LOG_DEBUG, "Block %4i: p_cbpcy=%i%i%i%i, previous_cbpcy=%i%i%i%i,"
                   " cbpcy=%i%i%i%i\n", mb_offset,
                   p_cbpcy[0], p_cbpcy[1], p_cbpcy[2], p_cbpcy[3],
                   previous_cbpcy[0], previous_cbpcy[1], previous_cbpcy[2], previous_cbpcy[3],
                   cbpcy[0], cbpcy[1], cbpcy[2], cbpcy[3]);
#endif
            *((uint32_t*)p_cbpcy) = *((uint32_t*)previous_cbpcy);
            *((uint32_t*)previous_cbpcy) = *((uint32_t*)cbpcy);
            mb_offset++;
        }
    }
    return 0;
}

/** Decode all MBs for an P frame in Simple/Main profile
 * @todo TODO: Process the blocks
 * @todo TODO: Use M$ MPEG-4 cbp prediction
 */
static int decode_b_mbs(VC9Context *v)
{
    MpegEncContext *s = &v->s;
    GetBitContext *gb = &v->s.gb;
    int mb_offset = 0, i /* MB / B postion information */;
    int b_mv_type = BMV_TYPE_BACKWARD;
    int mquant, mqdiff; /* MB quant stuff */
    int ttmb; /* MacroBlock transform type */
    
    static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },
        offset_table[6] = { 0, 1, 3, 7, 15, 31 };
    int mb_has_coeffs = 1; /* last_flag */
    int dmv1_x, dmv1_y, dmv2_x, dmv2_y; /* Differential MV components */
    int k_x, k_y; /* Long MV fixed bitlength */
    int hpel_flag; /* Some MB properties */
    int index, index1; /* LUT indices */
    int val, sign; /* MVDATA temp values */
    
    /* Select proper long MV range */
    switch (v->mvrange)
    {
    case 1: k_x = 10; k_y = 9; break;
    case 2: k_x = 12; k_y = 10; break;
    case 3: k_x = 13; k_y = 11; break;
    default: /*case 0 too */ k_x = 9; k_y = 8; break;
    }
    hpel_flag = v->mv_mode & 1; //MV_PMODE is HPEL
    k_x -= hpel_flag;
    k_y -= hpel_flag;

    /* Select ttmb table depending on pq */
    if (v->pq < 5)
    {
        v->tt_index = 0;
        v->ttblk4x4 = 3;
    }
    else if (v->pq < 13)
    {
        v->tt_index = 1;
        v->ttblk4x4 = 3;
    }
    else
    {
        v->tt_index = 2;
        v->ttblk4x4 = 2;
    }

    for (s->mb_y=0; s->mb_y<s->mb_height; s->mb_y++)
    {
        for (s->mb_x=0; s->mb_x<s->mb_width; s->mb_x++)
        {
            if (v->direct_mb_plane.is_raw)
                v->direct_mb_plane.data[mb_offset] = get_bits(gb, 1);
            if (v->skip_mb_plane.is_raw)
                v->skip_mb_plane.data[mb_offset] = get_bits(gb, 1);
            
            if (!v->direct_mb_plane.data[mb_offset])
            {
                if (v->skip_mb_plane.data[mb_offset])
                {
                    b_mv_type = decode012(gb);
                    if (v->bfraction > 420 /*1/2*/ &&
                        b_mv_type < 3) b_mv_type = 1-b_mv_type;
                }
                else
                { 
                    GET_MVDATA(dmv1_x, dmv1_y);
                    if (!s->mb_intra /* b_mv1 tells not intra */)
                    {
                        b_mv_type = decode012(gb);
                        if (v->bfraction > 420 /*1/2*/ &&
                            b_mv_type < 3) b_mv_type = 1-b_mv_type;
                    }
                }
            }
            if (!v->skip_mb_plane.data[mb_offset])
            {
                if (mb_has_coeffs /* BMV1 == "last" */)
                {
                    GET_MQUANT();
                    if (s->mb_intra /* intra mb */)
                        s->ac_pred = get_bits(gb, 1);
                }
                else
                {
                    /* if bmv1 tells MVs are interpolated */
                    if (b_mv_type == BMV_TYPE_INTERPOLATED)
                    {
                        GET_MVDATA(dmv2_x, dmv2_y);
                    }
                    /* GET_MVDATA has reset some stuff */
                    if (mb_has_coeffs /* b_mv2 == "last" */)
                    {
                        if (s->mb_intra /* intra_mb */)
                            s->ac_pred = get_bits(gb, 1);
                        GET_MQUANT();
                    }
                }
            }
            //End1
            if (v->ttmbf)
                ttmb = get_vlc2(gb, vc9_ttmb_vlc[v->tt_index].table,
                                VC9_TTMB_VLC_BITS, 12);

            //End2
            for (i=0; i<6; i++)
            {
                /* FIXME: process the block */
            }

            mb_offset++;
        }
    }
    return 0;
}
/** @} */ //End for group std_mb

#if HAS_ADVANCED_PROFILE
/***********************************************************************/
/** 
 * @defgroup adv_mb VC9 Macroblock-level functions in Advanced Profile
 * @todo TODO: Integrate to MpegEncContext facilities
 * @todo TODO: Code P, B and BI
 * @{
 */
static int advanced_decode_i_mbs(VC9Context *v)
{
    MpegEncContext *s = &v->s;
    GetBitContext *gb = &v->s.gb;
    int mqdiff, mquant, mb_offset = 0, over_flags_mb = 0;

    for (s->mb_y=0; s->mb_y<s->mb_height; s->mb_y++)
    {
        for (s->mb_x=0; s->mb_x<s->mb_width; s->mb_x++)
        {
            if (v->ac_pred_plane.is_raw)
                s->ac_pred = get_bits(gb, 1);
            else
                s->ac_pred = v->ac_pred_plane.data[mb_offset];
            if (v->condover == 3 && v->over_flags_plane.is_raw)
                over_flags_mb = get_bits(gb, 1);
            GET_MQUANT();

            /* TODO: lots */
        }
        mb_offset++;
    }
    return 0;
}
/** @} */ //End for group adv_mb
#endif

/** Initialize a VC9/WMV3 decoder
 * @todo TODO: Handle VC-9 IDUs (Transport level?)
 * @todo TODO: Decypher remaining bits in extra_data
 */
static int vc9_decode_init(AVCodecContext *avctx)
{
    VC9Context *v = avctx->priv_data;
    MpegEncContext *s = &v->s;
    GetBitContext gb;

    if (!avctx->extradata_size || !avctx->extradata) return -1;
    avctx->pix_fmt = PIX_FMT_YUV420P;
    v->s.avctx = avctx;

    if(ff_h263_decode_init(avctx) < 0)
        return -1;
    if (vc9_init_common(v) < 0) return -1;

    avctx->coded_width = avctx->width;
    avctx->coded_height = avctx->height;
    if (avctx->codec_id == CODEC_ID_WMV3)
    {
        int count = 0;

        // looks like WMV3 has a sequence header stored in the extradata
        // advanced sequence header may be before the first frame
        // the last byte of the extradata is a version number, 1 for the
        // samples we can decode

        init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);
        
        if (decode_sequence_header(avctx, &gb) < 0)
          return -1;

        count = avctx->extradata_size*8 - get_bits_count(&gb);
        if (count>0)
        {
            av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",
                   count, get_bits(&gb, count));
        }
        else if (count < 0)
        {
            av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);
        }
    }
    avctx->has_b_frames= !!(avctx->max_b_frames);

    s->mb_width = (avctx->coded_width+15)>>4;
    s->mb_height = (avctx->coded_height+15)>>4;

    /* Allocate mb bitplanes */
    if (alloc_bitplane(&v->mv_type_mb_plane, s->mb_width, s->mb_height) < 0)
        return -1;
    if (alloc_bitplane(&v->mv_type_mb_plane, s->mb_width, s->mb_height) < 0)
        return -1;
    if (alloc_bitplane(&v->skip_mb_plane, s->mb_width, s->mb_height) < 0)
        return -1;
    if (alloc_bitplane(&v->direct_mb_plane, s->mb_width, s->mb_height) < 0)
        return -1;

    /* For predictors */
    v->previous_line_cbpcy = (uint8_t *)av_malloc(s->mb_stride*4);
    if (!v->previous_line_cbpcy) return -1;

#if HAS_ADVANCED_PROFILE
    if (v->profile == PROFILE_ADVANCED)
    {
        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)
            return -1;
        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)
            return -1;
    }
#endif

    return 0;
    }

/** Decode a VC9/WMV3 frame
 * @todo TODO: Handle VC-9 IDUs (Transport level?)
 * @warning Initial try at using MpegEncContext stuff
 */
static int vc9_decode_frame(AVCodecContext *avctx,
                            void *data, int *data_size,
                            uint8_t *buf, int buf_size)
{
    VC9Context *v = avctx->priv_data;
    MpegEncContext *s = &v->s;
    int ret = FRAME_SKIPED, len, start_code;
    AVFrame *pict = data;
    uint8_t *tmp_buf;
    v->s.avctx = avctx;

    //buf_size = 0 -> last frame
    if (!buf_size) return 0;

    len = avpicture_get_size(avctx->pix_fmt, avctx->width,
                             avctx->height);
    tmp_buf = (uint8_t *)av_mallocz(len);
    avpicture_fill((AVPicture *)pict, tmp_buf, avctx->pix_fmt,
                   avctx->width, avctx->height);

    if (avctx->codec_id == CODEC_ID_VC9)
    {
#if 0
	// search for IDU's
	// FIXME
	uint32_t scp = 0;
	int scs = 0, i = 0;

	while (i < buf_size)
	{
	    for (; i < buf_size && scp != 0x000001; i++)
		scp = ((scp<<8)|buf[i])&0xffffff;

	    if (scp != 0x000001)
		break; // eof ?
	
	    scs = buf[i++];	

	    init_get_bits(gb, buf+i, (buf_size-i)*8);
	
	    switch(scs)
	    {
            case 0x0A: //Sequence End Code
                return 0;
            case 0x0B: //Slice Start Code
                av_log(avctx, AV_LOG_ERROR, "Slice coding not supported\n");
                return -1;
            case 0x0C: //Field start code
                av_log(avctx, AV_LOG_ERROR, "Interlaced coding not supported\n");
                return -1;
            case 0x0D: //Frame start code
                break;
            case 0x0E: //Entry point Start Code
                if (v->profile < PROFILE_ADVANCED)
                    av_log(avctx, AV_LOG_ERROR,
                           "Found an entry point in profile %i\n", v->profile);
                advanced_entry_point_process(avctx, gb);
                break;
            case 0x0F: //Sequence header Start Code
                decode_sequence_header(avctx, gb);
                break;
            default:
                av_log(avctx, AV_LOG_ERROR,
                       "Unsupported IDU suffix %lX\n", scs);
            }
	    
	    i += get_bits_count(gb)*8;
	}
#else
	av_abort();
#endif
    }
    else
        init_get_bits(&v->s.gb, buf, buf_size*8);

    s->flags= avctx->flags;
    s->flags2= avctx->flags2;

    /* no supplementary picture */
    if (buf_size == 0) {
        /* special case for last picture */
        if (s->low_delay==0 && s->next_picture_ptr) {
            *pict= *(AVFrame*)s->next_picture_ptr;
            s->next_picture_ptr= NULL;

            *data_size = sizeof(AVFrame);
        }

        return 0;
    }

    //No IDU - we mimic ff_h263_decode_frame
    s->bitstream_buffer_size=0;
        
    if (!s->context_initialized) {
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
            return -1;
    }
    
    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
        s->current_picture_ptr= &s->picture[ff_find_unused_picture(s, 0)];
    }
#if HAS_ADVANCED_PROFILE
    if (v->profile == PROFILE_ADVANCED)
        ret= advanced_decode_picture_primary_header(v);
    else
#endif
        ret= standard_decode_picture_primary_header(v);
    if (ret == FRAME_SKIPED) return buf_size;
    /* skip if the header was thrashed */
    if (ret < 0){
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
        return -1;
    }

    //No bug workaround yet, no DCT conformance

    //WMV9 does have resized images
    if (v->profile < PROFILE_ADVANCED && v->multires){
        //Parse context stuff in here, don't know how appliable it is
    }
    //Not sure about context initialization

    // for hurry_up==5
    s->current_picture.pict_type= s->pict_type;
    s->current_picture.key_frame= s->pict_type == I_TYPE;

    /* skip b frames if we dont have reference frames */
    if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable))
        return buf_size; //FIXME simulating all buffer consumed
    /* skip b frames if we are in a hurry */
    if(avctx->hurry_up && s->pict_type==B_TYPE)
        return buf_size; //FIXME simulating all buffer consumed
    /* skip everything if we are in a hurry>=5 */
    if(avctx->hurry_up>=5)
        return buf_size; //FIXME simulating all buffer consumed
    
    if(s->next_p_frame_damaged){
        if(s->pict_type==B_TYPE)
            return buf_size; //FIXME simulating all buffer consumed
        else
            s->next_p_frame_damaged=0;
    }

    if(MPV_frame_start(s, avctx) < 0)
        return -1;

    ff_er_frame_start(s);

    //wmv9 may or may not have skip bits
#if HAS_ADVANCED_PROFILE
    if (v->profile == PROFILE_ADVANCED)
        ret= advanced_decode_picture_secondary_header(v);
    else
#endif
        ret = standard_decode_picture_secondary_header(v);
    if (ret<0) return FRAME_SKIPED; //FIXME Non fatal for now

    //We consider the image coded in only one slice
#if HAS_ADVANCED_PROFILE
    if (v->profile == PROFILE_ADVANCED)
    {
        switch(s->pict_type)
        {
            case I_TYPE: ret = advanced_decode_i_mbs(v); break;
            case P_TYPE: ret = decode_p_mbs(v); break;
            case B_TYPE:
            case BI_TYPE: ret = decode_b_mbs(v); break;
            default: ret = FRAME_SKIPED;
        }
        if (ret == FRAME_SKIPED) return buf_size; //We ignore for now failures
    }
    else
#endif
    {
        switch(s->pict_type)
        {
            case I_TYPE: ret = standard_decode_i_mbs(v); break;
            case P_TYPE: ret = decode_p_mbs(v); break;
            case B_TYPE:
            case BI_TYPE: ret = decode_b_mbs(v); break;
            default: ret = FRAME_SKIPED;
        }
        if (ret == FRAME_SKIPED) return buf_size;
    }

    ff_er_frame_end(s);

    MPV_frame_end(s);

    assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
    assert(s->current_picture.pict_type == s->pict_type);
    if(s->pict_type==B_TYPE || s->low_delay){
        *pict= *(AVFrame*)&s->current_picture;
        ff_print_debug_info(s, pict);
    } else {
        *pict= *(AVFrame*)&s->last_picture;
        if(pict)
            ff_print_debug_info(s, pict);
    }

    /* Return the Picture timestamp as the frame number */
    /* we substract 1 because it is added on utils.c    */
    avctx->frame_number = s->picture_number - 1;

    /* dont output the last pic after seeking */
    if(s->last_picture_ptr || s->low_delay)
        *data_size = sizeof(AVFrame);

    av_log(avctx, AV_LOG_DEBUG, "Consumed %i/%i bits\n",
           get_bits_count(&s->gb), buf_size*8);

    /* Fake consumption of all data */
    *data_size = len;
    return buf_size; //Number of bytes consumed
}

/** Close a VC9/WMV3 decoder
 * @warning Initial try at using MpegEncContext stuff
 */
static int vc9_decode_end(AVCodecContext *avctx)
{
    VC9Context *v = avctx->priv_data;

#if HAS_ADVANCED_PROFILE
    av_freep(&v->hrd_rate);
    av_freep(&v->hrd_buffer);
#endif
    MPV_common_end(&v->s);
    free_bitplane(&v->mv_type_mb_plane);
    free_bitplane(&v->skip_mb_plane);
    free_bitplane(&v->direct_mb_plane);
    return 0;
}

AVCodec vc9_decoder = {
    "vc9",
    CODEC_TYPE_VIDEO,
    CODEC_ID_VC9,
    sizeof(VC9Context),
    vc9_decode_init,
    NULL,
    vc9_decode_end,
    vc9_decode_frame,
    CODEC_CAP_DELAY,
    NULL
};

AVCodec wmv3_decoder = {
    "wmv3",
    CODEC_TYPE_VIDEO,
    CODEC_ID_WMV3,
    sizeof(VC9Context),
    vc9_decode_init,
    NULL,
    vc9_decode_end,
    vc9_decode_frame,
    CODEC_CAP_DELAY,
    NULL
};